乘坐火车往东北方向旅行时,俯在窗口观望沿途景色,总会看见铁路两旁栽种的一排排笔直的高耸的白杨树。这些树每株都挨得很近,密植成行,有的行短些,有的长些。看到这样的杨树,我总是很感动,由衷感谢那些辛勤的植树人;这么多的树都 When traveling by train to the northeast, looking down the window to see the scenery along the way, you will always see rows of straight tall poplar trees planted on both sides of the railway. Each of these trees is very close, densely planted, some shorter, some longer. When I saw this kind of poplar tree, I was always touched and I sincerely thank those hard-working tree-planters; so many trees are